Idea: Rope

This idea consists of a rope and a balance on the upper part of the rope. The idea is that Henk can climb the rope and see his weight. The advantage is that the system is very compact. This idea is not possible for Henk because of two reasons:


- The muscles under his waste are not enough developed to support the weight of his legs. This could injure the muscles.


- It's very difficult to 'land' back in the wheelchair. When the rope is above the wheelchair, Henk would land with his feet in the chair. When the rope is in front of the wheelchair, Henk would land in front of the wheelchair.

First Ideas

These are the first ideas for the weighing mechanism:


Idea 1: 
This idea consists of presure points that can be placed under the legs of a chair. 

Idea 2:
This system can only be used on a chair with one leg. The advantage is that there's only one pressure sensor needed and there are less cables (less messy).

Idea 3:
This idea is basically some sort of add-on to use with a regular scale and a chair. The disadvantage of this system is that the display is not well readable. 

Idea 4:
This idea uses plastic tubes filled with water. The weight of the person causes pressure in the tubes. One can read the weight on the height of the water surface.

Idea 5:
This idea uses the system of a traditional scale with springs. (mechanical scale)